Checks if the tabBar is hidden when calculating the keyboard height. Inspired from @VincentSit fix in commit 9a6afb7
Checks if the tabBar is hidden when calculating the keyboard height. Inspired from @VincentSit fix in commit 9a6afb7

slackhq/SlackTextViewController,kobim/SlackTextViewController,slackhq/SlackTextViewController,kobim/SlackTextViewController